Free members with more than 1,000 photos or videos uploaded to Flickr will no longer be able to upload new content after Tuesday, January 8, 2019 unless they upgrade to Pro. After February 5, 2019, free accounts that contain over 1,000 photos or videos will have content deleted — starting from oldest to newest date uploaded — to meet the new limit. Members may always choose to download content over the limit at any time prior to these dates.

I had been a Flickr Pro subscriber for a long time, but the social interactions where mweh, and I had far less storage than the free tier anyway, so I let the Pro expire.

With about 33k photos, I seem to have no other options than to:

download everything, and find a new place, including all meta-information